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<h3>
Ben Gamari pushed to branch wip/T18580
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e409dcf76e20e48e6365d44797982c8f13e79d0">6e409dcf</a></strong>
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<span>by Ben Gamari</span>
<i>at 2020-08-17T13:04:16-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Fail if `timeout` is used when exceptions are masked
As pointed out in #18580, `timeout`'s implementation assumes that
exceptions will be handled. Document and assert this precondition.
Fixes #18580.
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<h4>2 changed files:</h4>
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<a href="#7f4e105bb4723b80c9d4e9bc14db5f93a742e0aa">
libraries/base/System/Timeout.hs
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<a href="#392e9dfd3417e267d708c5ab16536f2994d43745">
libraries/base/changelog.md
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<h4>Changes:</h4>
<li id="7f4e105bb4723b80c9d4e9bc14db5f93a742e0aa">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e409dcf76e20e48e6365d44797982c8f13e79d0#7f4e105bb4723b80c9d4e9bc14db5f93a742e0aa"><strong>libraries/base/System/Timeout.hs</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -27,8 +27,10 @@ import Control.Concurrent</td>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Exception</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Exception</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">handleJust</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">bracket</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">uninterruptibleMask_</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">asyncExceptionToException</span><span class="p">,</span></span>
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<pre style="margin: 0;">-<span id="LC30" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">asyncExceptionFromException</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">asyncExceptionFromException</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"> <span class="nf" style="color: #900; font-weight: 600;">getMaskingState</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">MaskingState</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Unique</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Unique</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">newUnique</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Stack.Types</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HasCallStack</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- An internal type that is thrown as a dynamic exception to</span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- interrupt the running IO computation when the timeout has</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -89,12 +91,16 @@ instance Exception Timeout where</td>
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note that 'timeout' cancels the computation by throwing it the 'Timeout'</span></span>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- exception. Consequently blanket exception handlers (e.g. catching</span></span>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'SomeException') within the computation will break the timeout behavior.</span></span>
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<pre style="margin: 0;">-<span id="LC92" class="line" lang="haskell"><span class="n" style="color: #333;">timeout</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Moreover, 'timeout' cannot be used when in a context enclosed by</span></span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- by 'Control.Exception.uninterruptibleMask'.</span></span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"><span class="n" style="color: #333;">timeout</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HasCallStack</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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97
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<pre style="margin: 0;"> <span id="LC97" class="line" lang="haskell"><span class="n" style="color: #333;">timeout</span> <span class="n" style="color: #333;">n</span> <span class="n" style="color: #333;">f</span></span>
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98
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<pre style="margin: 0;"> <span id="LC98" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fmap</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">f</span></span>
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99
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<pre style="margin: 0;"> <span id="LC99" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">==</span> <span class="mi" style="color: #099;">0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span></span>
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96
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100
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<pre style="margin: 0;"> <span id="LC100" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="kr" style="font-weight: 600;">if</span> <span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">defined</span><span class="p">(</span><span class="n" style="color: #333;">mingw32_HOST_OS</span><span class="p">)</span></span>
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97
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101
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">rtsSupportsBoundThreads</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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102
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"> <span class="n" style="color: #333;">checkNonUninterruptibleMask</span></span>
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103
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"></span>
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104
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In the threaded RTS, we use the Timer Manager to delay the</span></span>
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99
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105
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (fairly expensive) 'forkIO' call until the timeout has expired.</span></span>
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106
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -125,6 +131,7 @@ timeout n f</td>
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131
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="haskell"> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">fmap</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">f</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="haskell"><span class="o" style="font-weight: 600;">#</span><span class="n" style="color: #333;">endif</span></span>
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<pre style="margin: 0;"> <span id="LC133" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"> <span class="n" style="color: #333;">checkNonUninterruptibleMask</span></span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="haskell"> <span class="n" style="color: #333;">pid</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">myThreadId</span></span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"> <span class="n" style="color: #333;">ex</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">fmap</span> <span class="kt" style="color: #458; font-weight: 600;">Timeout</span> <span class="n" style="color: #333;">newUnique</span></span>
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="haskell"> <span class="n" style="color: #333;">handleJust</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">ex</span> <span class="kr" style="font-weight: 600;">then</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="nb" style="color: #0086b3;">()</span> <span class="kr" style="font-weight: 600;">else</span> <span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -134,3 +141,9 @@ timeout n f</td>
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141
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">uninterruptibleMask_</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">killThread</span><span class="p">)</span></span>
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135
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="haskell"> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">fmap</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">f</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC143" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- #7719 explains why we need uninterruptibleMask_ above.</span></span>
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="haskell"> <span class="n" style="color: #333;">checkNonUninterruptibleMask</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">HasCallStack</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span></span>
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146
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="haskell"> <span class="n" style="color: #333;">checkNonUninterruptibleMask</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="haskell"> <span class="n" style="color: #333;">maskingState</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getMaskingState</span></span>
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="haskell"> <span class="n" style="color: #333;">when</span> <span class="p">(</span><span class="n" style="color: #333;">maskingState</span> <span class="o" style="font-weight: 600;">==</span> <span class="kt" style="color: #458; font-weight: 600;">Unmasked</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"> <span class="n" style="color: #333;">error</span> <span class="s" style="color: #d14;">"System.Timeout.timeout called with exceptions uninterruptibly masked"</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6e409dcf76e20e48e6365d44797982c8f13e79d0#392e9dfd3417e267d708c5ab16536f2994d43745"><strong>libraries/base/changelog.md</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="markdown"><span class="gh" style="color: #999;"># Changelog for [`base` package](http://hackage.haskell.org/package/base)</span></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">## 4.16.0.0 *TBA*</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="markdown"><span class="p"> *</span> <span class="sb" style="color: #d14;">`System.Timeout.timeout`</span> now throws an error if called in a context where</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="markdown"> exceptions have been masked since its implementation relies on exceptions to</span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="markdown"> interrupt its sub-computation (fixes #18580).</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">## 4.15.0.0 *TBA*</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="markdown"><span class="p"> *</span> <span class="sb" style="color: #d14;">`openFile`</span> now calls the <span class="sb" style="color: #d14;">`open`</span> system call with an <span class="sb" style="color: #d14;">`interruptible`</span> FFI</span>
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